Question

One third of the people who attend a conference are from Spain and 3/10 are from France. Of the remaining attendees, 6/11 are from Switzerland and 25 people are from Italy. How many people attended the conference? ​

Answer 1

Respuesta:  

150 people.

Explicación paso a paso:

1) We add the fractions of France and Spain:

2) As it says: "of the rest" ...

, is the fraction of people who are neither from Spain nor from Switzerland.

3) They tell us that 6/11 of the previous fraction are Swiss:

×

4) We add French, Spanish and Swiss:

6) If it corresponds to the sum of all the attendees except the Italians, we deduce that:

persons.

Therefore, we obtain that: people.

7) We resolve:

That's the Spanish + Swiss + French, but ... the Italians are missing (+25).

persons.

I hope I've helped!